--Is my answer to the math problem fight?
---Let me consider it carefully I give you an answer.
| A．before | B．after | C．since | D．as soon as |
You know great changes _____________ in our school in the past ten years.
| A．have been taken place | B．took place |
| C．have taken place | D．were taken place |
Paul doesn’t know _________ about his problems.
| A．how to talk to | B．who to talk |
| C．where to talk to | D．who to talk to |
--Who _______ the Harry Potter series________ ? -- J.K.Rowling.
| A．did, be written | B．was, written |
| C．was, written by | D．did, be written by |
We know that about seventy percent _____ the earth _____ covered by water.
| A．/; is | B．of; are |
| C．of; is | D．about; are |
The question is _________ .
| A．so hard for us to understand it |
| B．too hard for us to understand it |
| C．too hard for us to understand |
| D．so hard for us to understand |